Kṛṣṇa says to Arjuna, yudhyasva mām anusmara (BG 8.7), "As a fighter, you have to fight. You cannot go away from fighting. It is not your duty." Nowadays—I have got experience, practical experience—that the drafting board of your country, calling some boy that "You join military," but he is not willing. Why? Because he is not trained as a kṣatriya. He is trained as a śūdra.
Therefore the caste system is very scientific. A section of people should be trained as brāhmins. Those who are intelligent enough in the society, they should be picked up for being trained in higher philosophical science. Those who are less intelligent than the brāhmins, they should be given military training.
We require everything—not that everyone is military man. This is nonsense. How everyone can be military man? Because they are sending śūdras to Vietnam, they are unnaturally being killed. So any country who is very proud of scientific advancement, if he does not know how to organize society, he is a fool. He's a fool.
In the Bhagavad-gītā you'll find Kṛṣṇa says that the four division of society: brāhmins, kṣatriya, vaiśya and śūdra. That is natural. Somebody is inclined for spiritual advancement, oh, they should be picked up as brāhmins. Now, we are training boys who are spiritually inclined, and now unnecessarily they are being called for military service. Just see how discrepancy. The foolish person has no knowledge that "This boy is being trained up in higher science. Why he should be disturbed?" But they have no idea. Therefore imperfect.
The intellectual persons, those who have got brahminical qualification . . . these boys are being restrained for being trained up as brāhmins, brahmacārī. They don't take, I mean to say, meat-eating; they don't take part in intoxication; they don't take part in gambling; they don't take part in illicit sex life. So they are being trained as complete brāhmin, the highest intellectual person, purified person in the society. If there is one brāhmin in a family, or one society, the whole family, whole society becomes sanctified.
So these rascals, they have no knowledge how to train as brāhmin, how to train as kṣatriya, how to train as vaiśya. Just like, of course, in other field of action, in the śūdras and vaiśyas, there is nice training in your country. If anyone wants to become a businessman, oh, there is training, colleges and schools, technological. That's nice, very nice. But why everyone should be dragged for technology? This is foolishness.
Just like in your body, for maintenance, proper maintenance of the body you require the head, you require the arms, you require the belly, you require the legs. So all these four divisions of the body required. You cannot say: "Oh, we don't require this head." Oh, it is nonsense. You require everything. You require the head, you require the arms, you require the belly and you require the leg. This is fit body.
Suppose if there is a body without head—oh, it is dead body. It is body undoubtedly, but if there is no head, simply the trunk is there, it is called dead body. The head is considered to be the intellectual part of the body. Similarly, if there is no brāhmin in the society, that is a dead body. If there is no spiritual man in the society, that is a dead society. This is very nice, natural division.